Sewing-machine



(ModeL) -3 Sheets-Sheet 1.

H. N. KJALMAN. Sewing Maohlne Patented Dec. 21, 1880.

W mvemon /%ATTORNEYI5/IY 1i PETERS, more (ModeL) 3 Sheets-Sheet? H. KJ'ALMAN. Sewing Machine.

"No. 235.783. Patented Dec. 21, 1380.

ATTORNEY/5!- N. PETERS, PHOTO-LITHOGRAPHER WASHINGTON n C (Mmieu I 3 Slieets-8heet 3. N. KJALMAN. V 1

Sewing Machine.

No. 235,783. Patented Dec; 21, 1880.

NFEIERS. FHOTOLITHOGRAFHER. WASHINGTON UNITED STATES PATENT @FFICE N. KJALMAN, OF HYDE PARK, ILLINOIS.

SEWING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 235,783, dated December 21, 1880. Application filed April 9, 1880. (ModeL) To all whom it may concern:

Be it known that I, HANS NIGOLAI KJAL- MAN, of Hyde Park, in the county of Cook and State of lllinois, have invented certain new and useful Improvements in Sewin g-Machines; and I do hereby declare that the following is a full, clear, and exact description of the invention, which will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying three sheets of drawings, which form a part of this specification.

The object of my invention is to simplify the construction of shuttle-machines; and to this end it consists in certain improvements in the mechanisms for operating the shuttle-driver, the take-up device, and the oloth-presser.

In the accompanying drawings, Figure 1 is a side elevation of a sewing-machine embody- 25, neck with its head removed.

ing my improvements, a portion of the frame being broken away. Fig. 2 is a bottom plan. Figs. 3 and 4 represent detail views of the tubular sliding cam for operating the shuttledriver. Fig. 5 is an end view of the goose- Fig. 6 is a perspective view of the interior of the said head with its appurtenances. Figs. 7 and 8 are perspective views representing, respectively,

the lower end of the needle-bar and of the feed-bar. Fig. 9 is a perspective view of the double eccentric or cam for operating said bars. Fig. 10 is a longitudinal sectional view of the machine. Fig. I1 is a detail view of the feeding mechanism, and Fig. 12 is a vertical section through the device represented in Fig. 7.

Similar letters of reference indicate correspondin g parts in all the figures.

A is the bed-plate or base, which is cast in one piece with the hollow post A and its overhanging hollow arm or goose-neck A 13 is the driving-shaft, which is rotated by the fly-wheel pulley a, and has secured upon its front end the double eccentric or cam 0.

Upon the rear end of shaft B is inserted a tubular cam, D, which has a slot, I), extending around the shaft, and curved to form a projection, (l, in the upper part of the cam.

c is a stud, which is inserted permanently into the shaft and provided with a frictionroller that works in the curved slot b,- and it follows that when shaft B is rotated cam D will slide forward and back upon the shaft which is inserted through it, on account of the conformation of the slot 1), the rising inclined curve of which, alike on both sides of the projection d, alternately impels the cam forward and back upon the shaft, the end of the rearward throw being reached as stud 0 passes the projection d.

(Jam D is made with a downward-projecting wing, e, in which is pivoted the upper end or head of a lever, E, which has its fulcrum at f, inside ,of the hollow post A. To the lower end of this lever is connected a pitman, F, which connects with the shuttle-driver Gr underneath the bed-plate.

(Jam 0, upon the forward end of the drivingshaft, consists of an eccentric, G, secured upon or made in one piece with a disk, 0, which is provided on its front face with a wrist-pin, 9, having a friction-roller, g.

The upper enlarged part of the feed-bar H is made with an opening of the configuration shown in dotted lines in Fig. 5, so as to ride upon the eccentric G, which projects into this opening; hence when the shaft is rotated, a vibratory reciprocating motion is imparted to the feed-bar. The vibrations or throw of the lower end of this bar, which is provided with the serrated feed-shoe H, may be regulated, to regulate the length of the stitches, by means of a thumb-nut, h, which works upon a screw inserted through the downwardly-projectin g slotted arm or extension I of the inclosinghead I, and also through the slot '6 in the feedbar, which rides upon the shank of the thumbnut k, that serves as an adjustable fulcrum for the feed-bar.

The needle-bar K, which works through perpendicular tubular hearings in head I, has a slotted plate, 70, affixed to it within the head, the curvilinear slot lin which plate receives the wrist-pin g with its friction-roller g. In rotating shaft B, with its disk 0, a vertical reciprocating motion is thus imparted to the needle-bar.

The take-up device consists of a short rod, L, which is inserted through an adjustable screw-threaded sleeve, M, inserted. through the top part of head I. At the lower end of bar or rod L is a shoe-piece, L, which impinges upon the upper part or head of the feed-bar H, against which it is pressed by a coiled spring, m, which is inserted (encirclin g rod L) into the sleeve M. The take-up lever N is hinged in the upper end of rod L, and projects with its' forward free end through a slot, 01., in the upper part of the needle-bar, which is hollow and provided with a spiral spring, n, that bears against the under side of the take-up lever.

The lower end of the needle-bar, into which the needle is inserted and held in place by a jam-screw in the usual manner, is made tubular to receive a spiral spring, W, as shown in Figs. 7 and 12, against the lower end of which the upper ends of the parallel arms of the cloth presser or holderimpinge. This presser consists of a piece of doubled steel wire, 0, bent at a right angle at its lower doubled end to form a projecting loop, 0, through which the point of the needle projects in operating the machine. The arms of the wire loop 0 are inserted into the tubular needle-bar, one on each side of the needle, and may be prevented from falling out by-formin g heads on their upper ends larger than the apertures in the plug K at the lower end of the needlebar, through which they are inserted.

The feed-bar may be lifted up from the bedplate upon which it works, and retained in its elevated position by means of the projecting pin 10, which engages with a slide, 1, working in a slot or recess in the end plate, Q, of the goose-neck A which slide 1? may be adjusted up or down to elevate or lower the feed-bar by means of a cam-lever, R, which is pivoted upon the outside of plate Q.

From the foregoing description, taken in connection with the drawings, it will be seen that this machine consists of com paratively few and simple parts, which are so constructed and combined as to operate with great ease with a minimum of friction, and to which access may readily be had, when necessary, for repair, adjustment, &c.

The means for adjusting the throw of the feed -bar viz., the thumb nut h, working through the slotted arm I and longitudinallyslotted feed-bar-admit of considerable variation in the length of the stitch, and by the arrangement of the yielding cloth-presser O 0, inserted into the end of the needle-bar, the fabric is kept down upon the bed-plate while the feeder returns and while the needle makes its loop. The thread X, after it leaves the tension device Y, is inserted through a wire eye or hook, :20, projecting from the top of head I to one side of the upper end of the reciprocating needle-bar and then passed up through the loop or eye in the outer end of the takeup lever N, as shown in Fig. 1, after which it is passed down to and inserted through the eye of the needle.

It will be seen that the tension of the takeup lever may be adjusted by adjusting the threaded sleeve M, the lower end of which bears against spring on, which regulates or controls the pressure of bar L, with its shoe L, against the upper slotted part or head of feed-bar H, so as to compensate for wear, and also that spring a, which is inserted into the tubular slotted head of the reciprocating needle-bar K, cushions the up and down strokes of the take-up lever N, thus avoiding breaking of the thread and maintainingits proper tension during the operation of the machine.

Having thus fully described my invention, I claim and desire to secure by Letters Patent of the United States- 1. In a sewing-machine, the combination of the driving-shaft B, having roller-stud c, tubular cam D, sliding upon said shaft and having curved slot 1) and wing e, lever E, pitman F, and shuttle-driver Gr, substantially as set forth.

2. In a sewing-machine, the combination of the driving-shaft B, having eccentric G, slotted feed-bar H, riding upon and operated by said eccentric, bar L, having spring m and shoe-piece L, hinged take-u p lever N, and slotted tubular needle-bar K, having spring a, substantially as set forth.

3. The combination, with the tubular needle-bar K, having plug K, of the spring a and cloth -presser O 0, the parallel arms of which are inserted into the needle-bar through its plug K and adapted to be depressed by the spring 41?, substantially as set forth.

4. The needle-bar K, made hollow or tubular in both ends, slotted at a, and provided with the springs a n plug K, and yielding cloth-presser 0 0, substantially as and for the purpose shown and set forth.

In testimony thatlclaimtheforegoing as my own I have hereto affixed my signature in presence of two witnesses.

HANS NIOOLAI KJALMAN.

Witnesses:

CHARLES JOHN DANIELSON, LEvI SPRAGUE. 

